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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e12fc2828c30ce7923d33f340ea4eeee3d63f0b62d9f06e3c6bef5b3f75194d' 
  AND token = 'As4SS6F/NWJBOo6r4IRS7AlVTw36Nxrw+8j2MJmHpi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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