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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b76aa9cb06b5b04f352f528b6677e212232ed64987d33c6b80714172c413cc1a' 
  AND token = 'a1HH/XkQ0UIt5UZimbTRH3xET6SLuPftKm2J76ekeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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