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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7616bc4f609bdcf0559064e46f34bfc0950f5886ca79b0475690d9137f001a64' 
  AND token = 'AXndfKZG14hu2cji/UIG3RkLGYectEH8oBpS81bsygk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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