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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4baa77b67b0ac84b06ca701a4f87aedba2884f419bbfa70582978dc0b258580f' 
  AND token = 'L3cJXYvTi/tkFcx8qjcboOFyGDGc2IQ/nZP9i6smPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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