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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60e489d1f83abf09df7bc299146479fed03742e9667aabe3a8431f4484d86cfc' 
  AND token = 'TuaKpv78yVDupMHJGydvlVjdvyX639vgwHK75Lfyapc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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