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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3832f89c3a0ae07f33c941a8e5f941eb2b93d4150f8cd34e01ec7bb3a684f3c6' 
  AND token = 'blbgV+gsh6/Vcs/M2bCl2KsK6ktq4esNxzfL+7vrmFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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