SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9391427ec93c94bf9420f9f952480cf5f09540b058edc96c86d886cb05e1948' 
  AND token = 'QKYbJeA+e5/sKl9pjmgYTWU46jwAqsLVSEE2fPWkIGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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