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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b2b7c4b6007d75d5ced56499eed5475bfa8cdd4a8c8741397f9c2b434bb46b0' 
  AND token = 'EgTSTvrmS0ZYz9hlda5Y48TNKzKx4ZIhApH+5+uFoWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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