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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d473948bf5e643bfb84529768fd17bd26b622e97837702ec01f5bf2d1fb4027' 
  AND token = '3tESQit2fql0FelGQNgZMzdsU9hrE3irCUJhq+7PGSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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