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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3784e78d5baf5c7aa8f2f488844505f593a4e9975a6f071c86d38c95e828e521' 
  AND token = '+Am03spTCzeUFfFpALTzsZ+V1mAn1sziNmOXuPLtA8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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