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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '919e7949ff84b793ec9198660710bd0962dced5199453127c91b732c59b3ac18' 
  AND token = 'r8N+iJWg506wu8Y9YTotoaxk2750is4wGZt8frhJV2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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