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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f47aebb79afec5d96dbb894539103a21ce768a05a5a76ded35183f37befa03' 
  AND token = 'Rz8siTVyyixMv45QE9dHo+OmA5KIMrnXagP8YgyWAJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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