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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdf4d00247e77f17f6e871040a39beaf7c5fc59857458fea7d6bb0fb34a6c531' 
  AND token = 'xzrA2EQLaMKU2bSGZY0MjESCE4VJw1Ebk4VEkYcTdP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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