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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c77808640b20dd7df1a99a2d33c188d31921c3e9819d332f6de098e97cfc3d3' 
  AND token = 'mTP3axqQGnPyg9WcBctia+qrCIpA9BMpomXe0qLHKKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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