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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '315e765247a8923e3d434b3ae122e68824cc3bf22d30e726d54f269b3ab57d78' 
  AND token = 'U23uOi3giUw65Qo+5maDGPHWO7gV5jgivyZHCDGQ6ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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