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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f52c0a81e61cc2720c71a9dd77bfbfafaa3f81324806220d05c854f36e5a24e7' 
  AND token = '6Pbc8w1Evk/VmE6Jti268TeyLgE1L5Mu0cv4bHYcroI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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