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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d3a030b92b77e8506920e95780b49f6d0e40985b05c0ce8cb3187a44c211de3' 
  AND token = 'b+SekJ2T4Bc1VKlx7ZWciXLlRQhamf2xWU/QNCjKgT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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