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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00036e94eb4e3c5d92010e9a4ce392318c1b11ed1052228e698c376a1b51f7b8' 
  AND token = '+BUkzCT3Gp6+aFUQJ33QaZp1VnyfjIvRaAy99p4lnR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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