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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '865161bcc1bd2c9ba3fd564bf48ce7517be3d7bb2194a800e1307d6c7208b03b' 
  AND token = 'hTZksI2C3nhCtiUkDKhTFWC8WNmEsAXbOopUe6/xOmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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