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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85fdf4ca8b80543a9bdaa780f70aa25cef205fe1ff9646a66b8eb6472c866f88' 
  AND token = 'CrhkWylymSL2PqwJyjZq8UDU5zAKCbMTZ7myV/6ESPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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