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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28400684c7fdbc0e90c4ba24b2599065389653efcc884468eb5565ff52ed47a9' 
  AND token = 'ye/7JNDXbyBUag0UClpM/U2sIvCb9oQhpA5x2ByFS8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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