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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '216fbc181a2bb609d52865bd975de74d09d253d2d5bf7ef32b0a965d7f675efa' 
  AND token = 'kk3k3vM2lSJFQBI4v7VpdDg29LbFGOligp6enRqQnNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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