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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3f6f5bcb072b64586da30fe90e35ae4b99cc51e4a9d0cd64b9baf08f7f71966' 
  AND token = 'vRxTPQvFkVKuW19nQm5l/QfLKRWn2Owf6j7a9tGSbrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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