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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3640f7be057180a7ad1c6408753ba64f4b1dae09183a1a9bd0da47b46f62655e' 
  AND token = 'Q5dITd0x/b6d/T6h7MZ5+t3BOXDAA4oK4iVxXwylHds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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