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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea4a1051eaf5d0aeba9ea98312a6ff67f4fb4be4cf56f98d11c339c5090904c' 
  AND token = 'f25DJR7n3ur32SZevggC1M/ex52J8PsVO5M6WC8LsfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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