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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a338411a87f6c334f4a9f77b37bf22685e619bbbcb49f61f36b8ef1f0a93735' 
  AND token = 'ik3sQfBKLgABste19rRzdPxLNv9xsKAr8gg450FHxn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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