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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa0697248cf8a6918a9cb18844d6f4d15902c8996e1581b8d4aa99d9e7bdb519' 
  AND token = 'yRVf19mvoCdQgP+MOVpq9uJryaGBN3zk5bjXIKr1wbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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