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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee84c4ceb07e30be08ca1e2c9a9d3eeeec4a19d2f8cbbb42e9c07d52b1c5b4eb' 
  AND token = 'UDsa75wbGt2+W6ONzBDjn2YrQ5687nxX/Dgog8pyfp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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