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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80c96a1e72b56498fab2f005950fbd026539c3d8b1d470b77e08646fcd0b9fb7' 
  AND token = '7H9np3QjL+pEbCdGCdQu2fiJE8USKgSfSnQPsehrnAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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