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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c448163373c02486ba4e2b3485d2f33aeb8c0f063e3cbf0a267b33b89d5977b6' 
  AND token = 'l+r46tPh2rqm6JGakl4F6oTqGA6wAt12iXFFVbP3ZKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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