SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '904084a99b5d7cb1f38d70d65c5cd2e61a1e6193813405f683bd6b1016415f93' 
  AND token = '/MGiPAJ4XShBWjHb+L07CSQqa0SBxaV8WCIG7nbI3Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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