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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef7c108e10a62887e78c9ee348c42b5055c989b8173bcf26e9b90d60d3312e4a' 
  AND token = 'CkOzWLFHGVmWPFnh0FaJ1AsvsIXMdpQAWfFBp1ioDHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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