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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52be1d53b058d4cb395ead7db2db4abc1a51d3d6e7c36eee9567b73f86650ca4' 
  AND token = 'TvkQw6GFluUmfA9qu2cB7aDr9uXnKIc+S7alGG2tz2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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