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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6123ac8c80b1ad3b76fa3abf60cdb875fb52fcf9413ce76c2973c01d345f920' 
  AND token = 'M9d6JxrqykJSgAIRxJAwuCTu17mTsHVpiT/9MuLY9cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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