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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e4d15d7eccb39f54d1fede35b9f944d87f2cbd143e2cc1a8a3d7d1d6fa5a38b' 
  AND token = '1tcMuJFe3gX1Mx3zPIXYaNu10VgVFMzH4bWcB00B8lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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