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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73ca9962f3e2f6dae44d232c7d6cc601cfa0f0f0193a6c9ebf50f9c24c172d0e' 
  AND token = 'BSazWzR4dOcQG+d8W+E0CR6CiIeNDBSdKZ3DtSISPGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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