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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'befa4e158ba15e2cbc13f403adb7e8c1d16f1fa4c2c68c20f7a2840bcba5a047' 
  AND token = 'FnyhshA6RqZdaYpDS8bqMKInGqHCbTWzCDuoN4fsU1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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