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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7e0fc7fad72abf6e2a43dfdfa15f37b68f46158bce51b896af62397bea9fcb' 
  AND token = 'r46AiFQB86F6/XsV8vK4bI9JmmV8l4nwoRMEm4c7s2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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