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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84a7ca4ea488aa11b0fbd1ffc29a39ee6e8c6f28d32f0f1b9de63b13d1d953ac' 
  AND token = 'hjDxTj2FHR1OERLvpHAuaUwCLBkzG0bH5xCQzyhV1lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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