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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f210da14c383ff52b995fff7596071e08cdd968d520b79a8debb2249efd3eff' 
  AND token = '3VwsQ3gF62o6wT6n4sWv/rJWUemFp3hSfudGcMhVoSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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