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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '536ee0ec732950dc2f4d6824d2f0724fa3c8930f9b7ca1f217ca9b4d4a30cc9d' 
  AND token = 'Il6QC+Vxx6zs1Le30ogcQ1iWfYKsTrj7FUNkVcxfuw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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