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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9ef5151b5e74cc55cc4cdafb7150253763ff20ed8b692ef6a2c0d4212b8a7d8' 
  AND token = 'fYDlOpOkgsARJfc3WtB3iEfinzFqQ4HouW1vbUptXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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