SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04eb461d7c83edad597f89b8a8b2018e2880672d937d66c0591c1cbe21872fce' 
  AND token = '1Ghk/jrvo2Z04RylGK+5QufMLeQcPszjKGLUg5KVevs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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