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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a74528f51cf2cac6c6beca429beaa6cfe6716fdc6e5a02ac63d5f06e3e612935' 
  AND token = 'zftKkcPBZ9D5B01J7NemHJfOe02UQRwEByTEF4oOxoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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