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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c23ab56323c0262879fbf7b76882a76ab801270639bf228b75fe207b7ec9427f' 
  AND token = '2JnpZfb/0AfF6eq6aZ7DbceN9glkdQz81r26pFryvv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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