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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e77a95547e6220eb28aed5abbf335bd6a40b8327e632f57e38fcace9919a7d1e' 
  AND token = 'U/C2pYke/zCU7jsMNhuMRFDrkm9+VEqji80GF/e+QMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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