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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67630d1c93d490d6f5aed1f3848d6bab560c7eb50f67aadc1cce2dee2184d71f' 
  AND token = 'SpenymITdrUK7xaaTQEITuVSnBLkFOEp4+FXodMQ5ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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