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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68ac4aa379a9bab80079207b20ffbd5ee3db564fc5231c7da03e10004b1c6008' 
  AND token = 'G9A1Gpo6ojY1apBqEsgpsUP0uzPu1qFtCm0Au+3GC0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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