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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baa61d52890ff37df4c40972ba707272d019087f23540edcc4819e5b5810653e' 
  AND token = '0By+lx6flgrkViiGlEBHbJFopTa2iTdn4P05s+W3EGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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