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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa63d052c68a5ad7a3d766b6cc59724a9fbb27a423b50528ff07640dc2c3ff21' 
  AND token = 'aATlLs0QH/GmNHT6dJankY7FjdG9kRw31RHmhB4X3Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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