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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a684b2af73feaee0a5624b4156350c77687f8266081d70c7a045c393f663840e' 
  AND token = 'ra64MxdLAtA1bt5/iVk/VDRTS4px0g2r2GapYEcXhMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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