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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823a4e18c58a3cdf828d04a89f8ea7bf312e193bc574a11711aee5ca35c0ff55' 
  AND token = 'LPZ10bW6L86+ijxQiw8HR8ac1e3LG7be83U6k7R+Nc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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