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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d919fb8de5e3c760d5c738f501f48c0764f77e20b82ee8a8e6abacc9ed51385' 
  AND token = 'eb7dHKNP0bySE09pJzWVE5udOPTKBVwyxlmouS16A94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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