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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa26f4492ddec6d5f232b1eca443b4ccbd7e8d3bfb52efcdfb93e2e5c5562c1e' 
  AND token = 'eF0hvh1XRk06fBxfgsCZyJ1XCHW+PIPQQTpR3KwHZ18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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