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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbfddcda8a1888fd0e7cabb37039bd43810273b4d54699708fa72463f8b4a116' 
  AND token = 'ksuiyMfDBvCpT0+uuqrO35eFSEcFXkUzRi5TwOi5VNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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