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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '933fe8a182c94e0a34d17d44eece6d22042f3bbeb8adb0bd675b25fb556d18c4' 
  AND token = 'pEZ6XxEfTsiuVahvwW5pOMAWQkHSrahq6uFb/d+F3Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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