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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28ef13c7cbde9f0cff99bca26f71e94c3327c48a7501ffaabb0af934b0b6641b' 
  AND token = '5gAMZfKnYtBjoy7jmuO3c8N55edvlYG72kKdEdDXrjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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