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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03e84510f9dee3e709f07d9edd73d82a3cb3bafcbdca0fd632c85b0cddc389c8' 
  AND token = '3c0RG7es69BwBhDbutZO3/nQ6b0Qh92fww0iiA/MwKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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