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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '229b235acfaeea781c4aa4d82792d36308f93a0ff099c1566737bdb44df0f1c2' 
  AND token = 'nB3Cw6N42AqCAQQfeqEp06bvBbvl715ww0bRuVGwKJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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