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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c6c55fbe5ddcfa8b76c914ee6c576f34e45ed2e24984393d1ebff6ec447f20' 
  AND token = 'pfaOldzCtK/0gAkQAHZ5Wzu7RTgxCIPG9Hws6w6qzGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}