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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd25515ffeaea20c799246ccbe3a261f8655cd9942d41688e2a235eb9d90abeea' 
  AND token = 'L7ETiuuOkG22KURZx8g6O1aOOE4Le/AxAx5P7IhBr90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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